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BD9130EFJ Datasheet(PDF) 5 Page - Rohm

No. de Pieza. BD9130EFJ
Descripción  Output 2A or More High-efficiency Step-down Switching Regulator with Built-in Power MOSFET
Descarga  15 Pages
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Fabricante  ROHM [Rohm]
Página de inicio  http://www.rohm.com
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BD9130EFJ Datasheet(HTML) 5 Page - Rohm

 
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BD9130EFJ
Technical Note
5/14
www.rohm.com
2009.05 - Rev.A
© 2009 ROHM Co., Ltd. All rights reserved.
Information on advantages
Advantage 1:Offers fast transient response with current mode control system.
Voltage drop due to sudden change in load was reduced by about 50%.
Fig.18 Comparison of transient response
Advantage 2: Offers high efficiency for all load range.
For lighter load:
Utilizes the current mode control mode called SLLM
TM for lighter load, which reduces various dissipation such as
switching dissipation (PSW), gate charge/discharge dissipation, ESR dissipation of output capacitor (PESR) and
on-resistance dissipation (PRON) that may otherwise cause degradation in efficiency for lighter load.
Achieves efficiency improvement for lighter load.
For heavier load:
Utilizes the synchronous rectifying mode and the low on-resistance
MOS FETs incorporated as power transistor.
ON resistance of P-channel MOS FET : 200mΩ(Typ.)
ON resistance of N-channel MOS FET : 160mΩ(Typ.)
Achieves efficiency improvement for heavier load.
Offers high efficiency for all load range with the improvements mentioned above.
Advantage 3:・Supplied in smaller package due to small-sized power MOS FET incorporated.
Reduces a mounting area required.
Fig.20 Example application
Fig.19 Efficiency
DC/DC
Convertor
Controller
RITH
L
Co
VOUT
CITH
VCC
Cin
10mm
15mm
RITH
CITH
CIN
CO
L
VOUT
IOUT
VOUT
IOUT
110mV
Conventional product (Load response IO=0.1A→0.6A)
BD9130EFJ (Load response IO=1A→2A)
Output capacitor Co required for current mode control: 22µF ceramic capacitor
Inductance L required for the operating frequency of 1 MHz: 2.2µH inductor
(BD9130EFJ:Co=22µF, L=2.2µH)
0.001
0.01
0.1
1
0
50
100
PWM
SLLM
TM
inprovement by SLLM system
improvement by synchronous rectifier
Output current Io[A]
29mV


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